The German Gun Collectors Association has a Imman Meffert catalog reprint available for purchase. Click here to go to thier site and to view what they have to offer.
Click on the above lines to see the Meffert files in PDF
The following images were supplied by the Harlock family of Western New York State. They are of a shotgun made by Imman. Meffert and sold by Nowotny in Prague.